Guests at over a dozen Trump-owned properties have had their personal information exposed by hackers over the past several months.

The infiltration is apparently the third time in as many years that guests at Trump Hotels have had their personal information, including credit card details, addresses and phone numbers, penetrated by cyber thieves.

According to The Washington Post, the breach hit 14 different properties belonging to the president and occurred between August 2016 and March 2017. Hotels hit by the cyberattacks were placed in New York, Washington DC and Vancouver.

Hackers were able to hit 14 different properties belonging to the president

Hackers were able to compromised the systems of Sabre Hospitality Solutions, a reservation booking service used by Trump Hotels, but did not affect the Trump Hotels’ systems.

'The privacy and protection of our guests’ information is a matter we take very seriously,' a notice posted to the company's website said, adding that Trump Hotels was notified of the breach on June 5.

According to a Sabre spokesperson, nearly 15 percent of daily bookings on the reservation system during the seven-month period were compromised.

Trump International Hotels Management paid the state of New York over $50,000 in penalties last year after failing to immediately notify guests that their personal information had been breached.

That cyber attack exposed 70,000 credit card numbers and 300 Social Security numbers. The company also agreed to update its security practices as a result of the settlement, the Post noted.

Peter W. Singer, a senior fellow at the New America Foundation, said that hotels are prime targets for hackers because they contain large caches of credit card information that is accessed with less obstacles because the hotel industry generally lags in cyber protection due to the vast amounts of information in their networks.

'Why are hackers targeting hotels? Well, because they’re a good target,' Singer told the Post. 'Then you look at Trump’s hotels, and they’re obviously a highly symbolic target.'

Singer posited that the Trump hotel chain was more prone to attack than ever before given President Donald Trump's stature on the national stage and the number of influential targets staying at Trump properties, including lawmakers, lobbyists and foreign dignitaries.

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'If more people are staying there in an attempt to curry favor with the government, the fishing pool of targets is certainly greater than it was prior to November,' he said.

Trump hotel properties were first breached in May 2014, when hackers installed malicious software on the hotel’s networks to scoop up credit card information from guests, an investigation conducted by the attorney general of New York discovered.

Trump Hotels was informed of the breach in June 2015 but did not post a notice on its website until four months later, according to the Post.

A second attack occurred over a year later, when an attacker installed malware on 39 systems affecting five Trump hotels in November 2015.

Earlier this year, President Donald Trump signed an executive order on cybersecurity that holds federal agency heads accountable for breaches in their networks.